Evaluation Of Formation Pressure In X Oilfield

With the deepening of oilfield development,water injection has been continuously strengthened,and well pattern has been continuously encrypted,resulting in great changes in underground seepage conditions compared with the initial stage of oilfield development.In particular,the actual pressure recovery curve often shows the characteristics of linear flow in the column water injection development reservoirs with fracture development and repeated fracturing.Even if the well is closed for a long time,there is no radial flow characteristic.The existing calculation methods of formation pressure,such as the Dietz method and the MBH method,are based on the plane radial flow,and can not fully meet the needs of the calculation of the formation pressure in the current oil field development adjustment.In addition,the higher the formation energy is,the better,not the better,the better the lower the better,but a reasonable formation pressure.It can be seen that the calculation method of the formation pressure needs further research and improvement.In this paper,the relation between the radius of the five point method,the seven point method and the nine point method is derived by using the superposition principle of the equivalent seepage flow resistance method and the potential superposition principle and the seepage theory.Using the pressure test data,the extrapolated tip pressure is determined,thus explaining the formation pressure under regular well pattern.In view of the irregularity of well network,the calculation method of formation pressure under irregular well network is established considering well network lack of well and injection.The reasonable formation pressure is analyzed and calculated by reservoir engineering method,the reasonable formation pressure of each block is given,and a mathematical model to solve the formation pressure is set up,and the number of the mathematical models is established.Model results are verified by value simulation...